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>> Oklahoma rattled by one of the strongest earthquakes ever to hit the state Saturday, its latest and most powerful in a series of recent tremors believed to be caused by an increase in oil and natural gas drilling. The 5.6 magnitude quake shook the town of Pawnee which is located just about an hours drive from the state capital of Oklahoma City.

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The most visible damage, facade of a building broken and sent crashing to the floor. There were no reports of casualties. The severity of the earthquake is sure to fuel a debate over the environmental impact of horizontal drilling for oil and gas, also called fracking. Just last year a state agency noted the close relationship between an uptick in seismic activity and the injection into the ground of the waste water that's left over from fracking.

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Oklahoma is heavily dependent on the energy industry which is responsible for one out of every four paychecks. And earthquakes there are now 600 times more prevalent than they were before 2008. Saturday's tremor was so strong, it was felt in six neighboring states.